Sheet fastener



FIG. 1 is a perspective view of the sheet fastener of my new design.

FIG. 2 is a perspective view of the sheet fastener in use;

FIG. 3 is a top plan view thereof.

FIG. 4 is a bottom plan view thereof.

FIG. 5 is a front elevational view thereof. The rear elevational view is a mirror image thereof; and,

FIG. 6 is a left side elevatonal view thereof. The right side elevational view is a mirror image of the left side elevational view.

The broken line figures in FIG. 2, depicting components of a bed; including a mattress, are environmental elements and form no part of my new design. 

CLAIM The ornamental design for a sheet fastener, as shown and described. 